only numbers in form

I have a validation script that i want to keep, but i have a question about how i write so that the script can check that only numbers is alowed, i want an alert to appear when there is an error, just like the rest of the script, se my code.

<script language="JavaScript" type="text/javascript">
function MCValidation()

if (document.mcform.frmParticipantPassword.value == "") {

alert("Password is required!");
return false;


if (document.mcform.frmParticipantPassword.value.length < 6) {

alert("Password must contain at least six characters!");
return false;


return true;


// -->

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if (/\D/.test(document.mcform.frmParticipantQuantity.value)) {

alert("Only number is allowed for quantity!");
return false;


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